Personally, I use the Coloplast one piece. I had a few incidents with Hollister...breakage of bag, so switched several months ago.
I had a few irritations under the wafer. I use stoma powder and it works great. My surgeon suggested leaving the wafer on longer, up to a week, because the irritation will be less. I leave it on about four days.
How's hubby doing these days? You're a great wife! My husband has been a ROCK for me. I sooo appreciate all the help he has given me. He still insists on changing my bag for me. I can do it myself, but he prides himself on it...lol. Sort of reminds me of my dad and mom. Mom was on peritoneal dialysis the last several years of her life and dad always did her exchanges. She knew how to do it but he felt needed. Poor soul died before mom did and she moved in with us for the last year of her life. They were married 58 yrs when dad passed. Oh well...getting off topic.
Best of luck to you and your hubby. Hope he improves daily. God bless.